%1 is not a valid win32 application error

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I Created a 64 bit exe and 32 bit com dll ... i did neccesary changes in registry as suggested by some site ..

now CoCreateInstance is returning :

HRESULT_FROM_WIN32(ERROR_BAD_EXE_FORMAT) : %1 is not a valid Win32 application. HRESULT


Could you please let me know why the error came which is mentioned above.

What I have tried:

int _tmain(int argc, _TCHAR* argv[])
{
	ICMATHCAUCULATOR *pMathcalci = nullptr;
	HRESULT hr;
	CoInitialize(NULL);
	hr = CoCreateInstance(CLSID_CMATHCAUCULATOR, NULL, CLSCTX_LOCAL_SERVER, IID_ICMATHCAUCULATOR, (void**)&pMathcalci);


	if (SUCCEEDED(hr))
	{
		cout << "function is called" << endl;
		double drresult = 0.0;
		pMathcalci->SumofTowNumbers(10.0, 50.0, &drresult);
		cout << " value is " << drresult << endl;
	}

	CoUninitialize();
	return 0;
}

exe is 64 bit dll is 32 bit